A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1494720 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 64 72 80 90 96 108 120 135 144 160 173 180 192 216 240 270 288 320 346 360 432 480 519 540 576 692 720 864 865 960 1,038 1,080 1,384 1,440 1,557 1,728 1,730 2,076 2,160 2,595 2,768 2,880 3,114 3,460 4,152 4,320 4,671 5,190 5,536 6,228 6,920 7,785 8,304 8,640 9,342 10,380 11,072 12,456 13,840 15,570 16,608 18,684 20,760 23,355 24,912 27,680 31,140 33,216 37,368 41,520 46,710 49,824 55,360 62,280 74,736 83,040 93,420 99,648 124,560 149,472 166,080 186,840 249,120 298,944 373,680 498,240 747,360 and 1,494,720, with no remainder.
Since 1,494,720 cannot be divided by just 1 and 1,494,720, it is not a prime number.